From Primary to End-of-Line Packaging Automation

• Vacuum conveyors utilize air pressure differences to move powders or small particles within a closed pipeline.
• Principle: Airflow carries dust particles, which are then separated by a filter.
• Advantages: 100% sealed, preventing dust pollution; suitable for pharmaceuticals and fine chemicals.
• Applications: Pharmaceutical powders, coffee powder, flour, chemical additives.

Unlike a single-head scale that fills a hopper until it reaches a target, a multi-head weigher uses multiple "heads" (weigh hoppers) to find the perfect combination. 

• Step 1: Distribution : Material is fed onto the top center cone and distributed to linear vibratory feeders. 

• Step 2: Feeding : Linear feeders move the product into feed hoppers. 。

• Step 3: Weighing : The product drops into weigh hoppers, where high-precision load cells measure the weight in each bucket. 

• Step 4: Calculation : The central processor calculates thousands of combinations in milliseconds to select the buckets whose sum is closest to the target weight without going under. 

• Step 5: Discharge : The selected buckets open, discharging the product into the packaging machine. 

While there are several types (Centrifugal, Linear, or Robotic), the most common Centrifugal (Rotary) Unscrambler follows these steps: 

1. Bulk Loading: Bottles are dumped into a large storage hopper and moved to the sorting bowl via an elevator. 

2. Centrifugal Sorting : The rotating disc uses centrifugal force to push bottles to the outer edge, where they enter "pockets" or "guides." 

3. Orientation : A specialized sensor or mechanical "hook" detects which end is the neck. If a bottle is upside down, the system flips it 180° or recirculates it. 

4. Discharge : Bottles are placed upright onto the conveyor belt and stabilized by a side belt or vacuum conveyor. 

Metal contamination is the #1 risk in food and pharma production. 

• How it works : It creates an electromagnetic field. When a metal particle (Ferrous, Non-Ferrous, or Stainless Steel) passes through, it disturbs the field, triggering an alarm and rejection. 

• Industry Standards : Modern units offer Multi-Frequency technology to ignore the "product effect" (where wet or salty food mimics a metal signal). 

A checkweigher measures the weight of every single product on the fly without stopping the line. 

• How it works : As the product passes over a high-precision load cell, the system compares its weight against the target. If it falls outside the pre-set tolerance, an air-blast or pusher rejects it. 

• Key Value : Ensures compliance with "Average Weight" legislation and prevents "Product Giveaway" (overfilling). 

Vision systems use high-speed cameras and AI to "see" defects that the human eye might miss. 

• What it inspects :

  • Labeling : Is the label straight? Is it the correct SKU? 

  • Codes : Is the Expiry Date or Batch Code legible? (OCR/OCV technology). 

  • Cap & Seal : Is the cap skewed? Is the tamper-evident seal broken? 

A case erector (or case former) pulls a flat cardboard blank, squares it up, folds the bottom flaps, and seals them with tape or hot melt glue. 

• How it works : Vacuum suctions pull the blank from a magazine. A mechanical arm "squares" the box to ensure it’s not skewed, and the bottom is sealed to create a sturdy container.

• Key Feature: Magazine Capacity : High-end models allow for "on-the-fly" loading, meaning operators can add more cardboard without stopping the machine.

Once the box is ready, the Case Packer takes the products (bags, bottles, or boxes) and places them inside according to a specific pattern. 

There are three main types used in modern facilities: 

• Top Load : Ideal for bottles and jars. Often uses a Delta Robot (Spider Robot) or a pick-and-place arm. 

• Side Load : Best for boxed products (like cereal or medicine). The products are pushed horizontally into the case. 

• Wrap-Around: The machine folds the cardboard around the product group. This uses less cardboard and is common in the beverage industry.

Traditional palletizing involved massive, fixed-position machines. Today, industrial robotic arms have taken over due to their flexibility. 

• How it works: A high-payload robot arm (typically 4-axis or 6-axis) uses a customized End Effector (vacuum suction, mechanical grippers, or magnetic plates) to pick cases from the conveyor and stack them on a pallet according to a pre-programmed pattern. 

• Key Benefit: Pattern Flexibility : Robots can handle multiple case sizes and complex "interlocking" patterns that provide maximum stability during shipping.

Once a pallet is stacked, it must be "unitized" for transport. An Automatic Stretch Wrapper applies layers of plastic film with precise tension. 

• Turntable vs. Rotary Arm :

  • Turntable : The pallet spins while the film carriage moves up and down.

  • Rotary Arm: The pallet stays still while a mechanical arm rotates around it—ideal for very heavy or unstable loads.